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Posted to issues@kudu.apache.org by "YifanZhang (JIRA)" <ji...@apache.org> on 2019/08/03 08:36:00 UTC
[jira] [Comment Edited] (KUDU-2914) Rebalance tool support moving
replicas from some specific tablet servers
[ https://issues.apache.org/jira/browse/KUDU-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16899412#comment-16899412 ]
YifanZhang edited comment on KUDU-2914 at 8/3/19 8:35 AM:
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Thanks for explanations, I agree that for maintenance rereplicating all replicas brings no benefits.
Thus this issue is very similar to KUDU-1827, my idea is making improvements on rebalance tool to support batch migrating replicas from some specified tservers to the others. But maybe this way isn't graceful enough for we call 'move_replica' many times, see KUDU-2246, it could be more reliable in certain edge-case scenarios.
was (Author: zhangyifan27):
Thanks for explanations, I agree that for maintenance rereplicating all replicas brings no benefits.
Thus this issue is similar to KUDU-1827.
> Rebalance tool support moving replicas from some specific tablet servers
> ------------------------------------------------------------------------
>
> Key: KUDU-2914
> URL: https://issues.apache.org/jira/browse/KUDU-2914
> Project: Kudu
> Issue Type: Improvement
> Components: CLI
> Reporter: YifanZhang
> Priority: Minor
>
> When we need to stop/upgrade some tablet servers in a kudu cluster, these tservers would become unavailable and tablets on these servers would be unhealthy in a period of time. In order to ensure the high availability of the cluster, it's better to move all replicas on these tservers to other tservers in a cluster, then stop or upgrade tservers. This can be achieved by rebalance tool to support specifying 'blacklist_tservers'.
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